Packaging difference between V8 & V9

I have an app (created using Lazarus IDE) that has been running for years. Firstly on CentOS 7 then CentOS 8 and then Alma Linux 8.6. I did a recompile in dec 2022. So far all had been good.
When I move the app to A V9.3 server I get this error message when the app starts.

Gtk-Message: 11:14:39.245: Failed to load module “pk-gtk-module”

I copied the sources over and after a rebuild using Lazarus 2.2.6 AND 3.0.0, I get the same error message. This leads me to suspect some differences in the packaging of GTK between V8.x and V9.x.
So far, I have not been able to find out where this error message comes from. All the other instances of this message that have been reported, don’t seem to be relevant to this problem.
The app does work but as a long time software developer, I do not like error messages that I can’t explain away.
If anyone has any ideas about where this comes from, I would be most grateful.
PS, it also does the same on Rocky Linux so I suspect that it is a change that RedHat has made.

Do you have PackageKit-gtk3-module installed?

Yes, it is installed. (V1.2.4-2.el9.x86_64)